ASUS RT-AC68U Merlin update from 380.70 to 384.6 CPU lag

[-Skyrider-]

As of today I updated my ASUS RT-AC68U router from 380.70 to 384.6. I've backed up my settings and restored it on the latest firmware (after factory reset).

Noticed that after a few minutes, CPU (mostly just 1 core) is going haywire and makes the router's web GUI almost impossible to load, and my internet is sluggish.

According to TOP (couldn't install htop), most CPU sucking applications were:

- mtdblock3 (19.2% on CPU 1)
- migration/0 (17.0% on CPU 0)
- /sbin/preinit (10.3% on CPU 1)

Is it because I recovered settings from a 380 firmware into 384? For now I downgraded back to 380.x and it's working perfectly fine again. I noticed a factory reset was highly recommended, but nothing was said about not restoring the settings.

PS, sorry about the duplicate post. Already requested the other one to be removed as I can't soft-delete it myself.

 

[AndreiV]

Is it because I recovered settings from a 380 firmware into 384? For now I downgraded back to 380.x and it's working perfectly fine again. I noticed a factory reset was highly recommended, but nothing was said about not restoring the settings.

If a reset is required ( and it certainly is in this case) you can't use old settings from a back up , you are mixing the old and new firmware.

Install firmware and factory reset .......

Please read >>> https://www.snbforums.com/threads/faq-nvram-and-factory-default-reset.22822/

 

[M@rco]

Is it because I recovered settings from a 380 firmware into 384?

Most likely, yes. Make screenshots of your settings, upgrade to the latest branch, do a factory reset, initialize if nescessary (on the reset page) reboot, and start fresh. You need to manually reconfigure your router and your problems will be gone.

 

[-Skyrider-]

Thanks, just wanted a confirmation

It's a shame I can't select specific things to backup (such as the port settings), guess I'll have to manually do everything again.

Appreciate the replies.

 

[RMerlin]

Also note that as you move from 380.xx to 384.xx, the router needs to use completely different Trend Micro signature files. Your CPU will spike for a bit on the first boot, as it has to download and process updated signature files.